Meaning of THORIUM
| Pronunciation: | | 'thowreeum
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 WordNet Dictionary |
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| | Definition: | | [n] a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands |
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| | Synonyms: | | atomic number 90, Th |
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| | See Also: | | metal, metallic element, monazite, radiothorium, thorite, thorium-228 | |
| Webster's 1913 Dictionary |
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| | Definition: | | \Tho"ri*um\, n. [NL. See {Thorite}.] (Chem.)
A metallic element found in certain rare minerals, as
thorite, pyrochlore, monazite, etc., and isolated as an
infusible gray metallic powder which burns in the air and
forms thoria; -- formerly called also {thorinum}. Symbol Th.
Atomic weight 232.0.
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